EP0480558B1 - Dispositif de commande du niveau du signal de sortie - Google Patents

Dispositif de commande du niveau du signal de sortie Download PDF

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Publication number
EP0480558B1
EP0480558B1 EP91303933A EP91303933A EP0480558B1 EP 0480558 B1 EP0480558 B1 EP 0480558B1 EP 91303933 A EP91303933 A EP 91303933A EP 91303933 A EP91303933 A EP 91303933A EP 0480558 B1 EP0480558 B1 EP 0480558B1
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EP
European Patent Office
Prior art keywords
output level
signal
level
attenuation amount
reproduced
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91303933A
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German (de)
English (en)
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EP0480558A2 (fr
EP0480558A3 (en
Inventor
Takahumi C/O Pioneer Electronic Corp. Shiba
Hirokazu c/o Pioneer Electronic Corp. Inotani
Fumihiro c/o Pioneer Electronic Corp. Nakajima
Seiichi c/o Pioneer Electronic Corp. Hasebe
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Pioneer Corp
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Pioneer Electronic Corp
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Publication of EP0480558A2 publication Critical patent/EP0480558A2/fr
Publication of EP0480558A3 publication Critical patent/EP0480558A3/en
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Publication of EP0480558B1 publication Critical patent/EP0480558B1/fr
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/3026—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching

Definitions

  • the present invention relates to an output level controlling apparatus in an apparatus for reproducing recorded information, and more particularly to an improvement in an output level controlling apparatus for controlling the reproduced output level of a reproduced digital signal by means of a digital attenuator.
  • a compact disk is sometimes used as a music source for background music (BGM), and a plurality of compact disks CD are sometimes loaded in an automatic player in which the compact disks CD are continuously played to produce BGM.
  • BGM background music
  • the peak value of each of the signal levels of the information recorded on all compact disks (for example, 6 disks) loaded in an automatic player may be previously read, and the read peak values may be matched to the lowest peak value.
  • all compact disks since all compact disks must be reproduced for reading the peak value of each of the signals, a certain time is required for preparation before BGM playing.
  • This inventor thus proposed an output level controlling apparatus in a feedforward system in which an appropriate output level for BGM is previously statistically determined to produce a reference value of output levels, and an actual output level is compared with the reference value so that the appropriate output level is maintained by controlling a digital attenuator in accordance with the reproduced output level of the reading/recording signal with the results of comparison (Japanese Patent Laid-Open No. 1-231510). Since this apparatus employs the feedforward system, no time is required for preparation.
  • BGM plural pieces of music or a plurality of record media are continuously reproduced.
  • a piece of music is continuously reproduced while maintaining the attenuation amount of the before piece of music, for example, if the level of the music to be reproduced is low, the starting portion of the music cannot be heard.
  • US-A-4926485 discloses an output level controlling apparatus with signal dependent attenuation.
  • E. STIKFOORT discloses a digital dynamic range compressor for audio.
  • an object of the present invention to provide an output level controlling apparatus which is capable of removing aural sound vibrations and momentarily attenuating a high input level and which has no problem that the starting portion of music cannot be heard even if plural pieces of music are continuously reproduced.
  • the present invention provides an output level controlling apparatus comprising signal attenuating means for attenuating a reproduced output level of a reading/recording signal read from a record medium, signal level deciding means for comparing said reproduced output level of said reading/recording signal with a reference signal level previously set, and output level correcting means for sending a control signal to said signal attenuating means to increase or decrease an attenuation amount on the basis of results of the comparison made by said signal level deciding means, characterized in that: said output level correcting means sends the control signal to said signal attenuating means to rapidly attenuate the reproduced output level when said reproduced output level is higher than said reference signal level and to slowly increase the reproduced output level by decreasing the attenuation amount when said reproduced output level is lower than said reference signal level.
  • the reading/recording signal is input to the signal attenuating means and the level deciding means.
  • the reference signal level is previously set in the level deciding means, and the output level correcting means sends the control signal to the signal attenuating means so as to rapidly attenuate the reproduced output level of the reading/recording signal when the reproduced output level of the reading/recording signal is higher than the reference signal level.
  • the output level correcting means sends the control signal to the attenuating means so as to slowly increase the reproduced output level of the reading/recording signal.
  • the reading/recording signal is input to the signal attenuating means, the level deciding means and the inter-information signal detecting means, respectively.
  • the exchange signal is input to the inter-information signal detecting means.
  • the reference signal level is previously set in the level deciding means so that the output level correcting means sends the control signal to the signal attenuating means so as to rapidly attenuate the reproduced output level of the reading/recording signal when the reproduced output level of the reading/recording signal is higher than the reference signal level.
  • An attenuation value corresponding to the control signal is set in the signal attenuating means.
  • the output level correcting means sends the control signal to the attenuating means so as to slowly increase the reproduced output level of the reading/recording signal.
  • An attenuation value corresponding to the control signal is set in the signal attenuating means.
  • the exchange signal or the inter-information signal in the reading/recording signal is detected by the inter-information signal detecting means.
  • the reset signal for returning the set attenuation value to an initial value is sent to the attenuating means so that the set attenuation value is returned to the initial value.
  • an output level controlling apparatus comprises: signal attenuating means 1 for attenuating the reproduced output level of a reading/recording signal RR read from a record medium; signal level deciding means 2 for comparing the reproduced output level of the reading/recording signal with a reference signal level previously set; and output level correcting means 3 for sending a control signal CS to the signal attenuating means 1 on the basis of results of the comparison made by said signal level deciding means 2 so as to increase an attenuation amount of the reproduced output level of the reading/recording signal RR when the reproduced output level is higher than the reference signal level and so as to decrease an attenuation amount of the reproduced output signal level of the reading/recording signal RR when the reproduced output signal level is lower than the reference signal level, the output level correcting means 3 sending said control signal so as to rapidly decrease or slowly increase the reproduced output level of the reading/recording signal.
  • an output level controlling apparatus comprises: signal attenuating means 1 for attenuating the reproduced output level of a reading/recording signal RR read from a record medium; inter-information signal detecting means 4 for detecting an exchange signal generated during exchange of a plurality of record media or an inter-information signal in the reading/recording signal RR; signal level deciding means 2 for comparing said reproduced output level of said reading/recording signal to a reference signal level previously set; and output level correcting means 3 for sending a control signal to said signal attenuating means 1 on the basis of the results of the comparison made by said signal level deciding means 2 so as to increase an attenuation amount of the reproduced output level of the reading/recording signal when the reproduced output level is higher than the reference signal level and so as to decrease an attenuation amount of the reproduced output signal level of the reading/recording signal RR when the reproduced output signal level is lower than the reference signal level, the output level correcting means sending the control
  • FIG. 3 shows a block diagram of an output level controlling apparatus in accordance with the first embodiment of the present invention.
  • a signal recorded on CD (not shown) is read, and an RF signal is input to a decoder 11 after a predetermined processing.
  • An output signal data as reading/recording signal which is outputted from the decoder 11 is input to a digital attenuator 13 serving as signal attenuating means through a delay circuit 12.
  • the data is subjected to a predetermined attenuation processing in the attenuator 13 and then output to a digital/analogue converter 14.
  • the digital/analogue converter 14 outputs a sound signal.
  • the delay circuit 12 is a circuit for ensuring a processing time required for the controller 16 described below and the time required for sending the control signal to the digital attenuator 13.
  • the signal data outputted from the decoder 11 is also input to a level deciding section 15 serving as level deciding means and the bus B described below.
  • a comparative reference value V ref is set as a reference level for the output signal data in the signal level deciding section 15.
  • the controller 16 serving as output level correcting means comprises the bus B and a CPU 17, a RAM 18, an interface circuit 19 for sending the control singal to the digital attenuator 13 and a ROM 20 for storing a program, all of which are connected to the bus B.
  • An input section 21 for inputting the time factors, attenuation amount and the like, which are described below, is also connected to the bus B.
  • the CPU 17 has an attenuator value deciding section 17a for changing the attenuation amount of the section 17b for detecting the presence of a space between two pieces of music from Q channel data in the sub-coding of CD.
  • the RAM 18 has a first time factor storing section (first counter) 18a, a second time factor storing section (second counter) 18b, an attenuator value storing section 18c, an increment setting section 18d, and a decrement setting section 18e.
  • a time factor t 0 for setting a time width t shown in FIG. 6, as described below, is set in the first time factor storing section 18a.
  • a time factor T 0 for setting a time width T shown in FIG. 6 is set in the second time factor storing section 18b.
  • Attenuator value storing section 18c are stored a value determined by the attenuator value deciding section 17a and a value input from the input section 21.
  • An increment and a decrement of the attenuation amount are set in the increment setting section 18d and the decrement setting section 18e, respectively.
  • the time factor t 0 positive integer
  • the time factor T 0 positive integer
  • the attenuation amount of zero the increment a and the decrement A are input as initial set values to the first time factor storing section 18a, the second time factor storing section 18b, the attenuator value storing section 18c, the increment setting section 18d and the decrement setting section 18e, respectively (Step S1).
  • a processing without level control described below is performed (Step S2), and the level (sound level data) of the signal outputted from the decoder 11 is read by the level deciding section 15 (Step S3).
  • Step S4 the output signal level is thus compared with the comparative reference value V ref , and the following processing is then performed according to the results of comparison:
  • Step S4 If it is decided in Step S4 that the output signal level is higher than the comparative reference value V ref , data is read from the attenuator value storing section 18c, and a decision is made as to whether the attenuation amount of the digital attenuator 13 is set to the maximum (Step 5). In FIG. 6, the maximum value corresponds Mmax. If the attenuation amount is not the maximum, a decision is made as to whether or not a value stored in the first time factor storing section 18a is zero (Step S6). If the stored value is not zero (Step S6; No), that is, a time position P is located at an intermediate position in FIG.
  • Step S9 the value stored in the first time factor storing section 18a is decreased by 1 (Step S9), and the flow is then returned to Step S2.
  • the time width t can be set to any desired value by using the value set in the first time factor storing section 18a.
  • Step S4 If it is decided in Step S4 that the output signal level is lower than the comparative reference value V ref , a decision is made as to whether or not a value stored in the attenuator value storing section 18c is set to zero (Step S10). If the stored value is not zero (Step S10; No), a decision is made as to whether or not the value stored in the second time factor storing section 18b is zero (Step S11). If the stored value is not zero, the value stored in the second time factor storing section 18b is decreased by 1 (Step S14), and the flow is then returned to Step S2. The above processing is repeated until the value stored in the second time factor storing section 18b is zero.
  • Step S11 If the stored value is zero (Step S11; Yes), the attenuation amount is decreased by an amount A (Step S12), and the time factor T 0 is then set in the second time factor storing section 18b (Step S13). The flow is then returned to Step S2.
  • Step S10 If it is decided in Step S10 that the attenuation amount is zero (Step S10; Yes), since the attenuation amount cannot be further decreased, the time factor T 0 is set in the second time factor storing section 18b, and the flow is then returned to Step S2.
  • the second embodiment is the same as the first embodiment except that an inter-music space detecting section 17b is added to the CPU 17 in the block diagram of the first embodiment shown in FIG. 3.
  • FIG. 5 shows the flowchart in which Step S3a is inserted between Steps S3 and S4 shown in FIG. 4 and which is provided for detecting data about a space between two pieces of music.
  • Step S3 when the inter-music space detecting section 17b serving as inter-information signal detecting means detects inter-music data (Q channel data) (Step S3a; Yes), the attenuation amount of zero is stored in the attenuator value storing section 18c.
  • the reset control signal of the attenuation amount of zero is output to the digital attenuator 13 through the interface 19 (Step S3b) so that the attenuation amount is set to zero.
  • Step S3a No
  • the processing after Step S4 may be performed in the same way as in the first embodiment.
  • the output level of music is generally low immediately after the start of playing.
  • the attenuation amount is set to zero, there is no danger of excessively decreasing the output level of the next piece of music at the start of playing. This causes an improvement in aural feeling.
  • the second embodiment concerns a case in which the initial value of the attenuation amount is set to zero when inter-music data is detected, appropriate initial values other than zero may be set according to musical environments of BGM.
  • the second embodiment also concerns the case of a space between two pieces of music in the same disk
  • the embodiment can be applied to the disk exchange in an automatic player.
  • an exchange signal generated during CD exchange or an inter-information signal which is a signal based on the silent portion at the beginning of each CD may be input to the inter-information signal detecting means 4.
  • the attenuation amount is momentarily or rapidly increased, and it is gently or slowly decreased. It is therefore possible to rapidly attenuate a high input level for preventing the output in a high level. It is also possible to prevent the musical environment of BGM from being destroyed and aural vibrations from occurring during level adjustment.
  • the initial value is set in the signal attenuating means after the passage of a time between two pieces of music or when a record medium is replaced by a new one, even if a silent period is present after the passage of the time between two pieces of music or during the exchange, there is neither sudden change in the output level at the start of the next piece of music nor feeling of aural discomfort.

Claims (9)

  1. Dispositif de commande de niveau de sortie comprenant des moyens d'atténuation de signal (1) destinés à atténuer un niveau de sortie reproduit d'un signal de lecture/enregistrement (RR) lu à partir d'un support d'enregistrement, des moyens de décision de niveau de signal (2) destinés à comparer ledit niveau de sortie reproduit dudit signal de lecture/enregistrement avec un niveau de signal de référence fixé au préalable et des moyens de correction de niveau de sortie (3) destinés à envoyer un signal de commande auxdits moyens d'atténuation de signal pour augmenter ou diminuer une quantité d'atténuation sur la base des résultats de la comparaison effectuée par lesdits moyens de décision de niveau de signal, caractérisé en ce que :
       lesdits moyens de correction de niveau de sortie (3) envoient le signal de commande auxdits moyens d'atténuation de signal pour atténuer rapidement le niveau de sortie reproduit lorsque ledit niveau de sortie reproduit est supérieur audit niveau de signal de référence et pour augmenter lentement le niveau de sortie reproduit en diminuant la quantité d'atténuation lorsque ledit niveau de sortie reproduit est inférieur audit niveau de signal de référence.
  2. Dispositif de commande de niveau de sortie selon la revendication 1, dans lequel ledit dispositif comprend, de plus, des moyens de détection de signal interinformations destinés à détecter un signal de changement généré pendant le changement d'une pluralité de supports d'enregistrement ou un signal interinformations dans ledit signal de lecture/ enregistrement et pour envoyer un signal de réinitialisation pour remettre la valeur d'une quantité d'atténuation fixée dans lesdits moyens d'atténuation de signal à une valeur initiale lors de la détection dudit signal de changement de supports d'enregistrement ou dudit signal interinformations.
  3. Dispositif de commande de niveau de sortie selon la revendication 1 ou 2, dans lequel lesdits moyens de correction de niveau de sortie (3) comprennent une unité centrale, des premiers moyens de mémoire (18) destinés à stocker des données pour atténuer le niveau de sortie reproduit et des moyens d'interface (19) destinés à envoyer le signal de commande et des seconds moyens de mémoire (20) destinés à stocker un programme pour commander lesdits moyens de correction de niveau de sortie (3).
  4. Dispositif de commande de niveau de sortie selon la revendication 3, dans lequel ladite unité centrale comprend une section de décision de valeur d'atténuation (17a) pour modifier la quantité d'atténuation et une section de détection d'espace intermusique (17b) pour détecter un espace entre deux morceaux de musique à partir du support d'enregistrement concerné.
  5. Dispositif de commande de niveau de sortie selon la revendication 4, dans lequel lesdits seconds moyens de mémoire (18) comprennent une première section de stockage de période de temps (18a) pour fixer une période de temps utilisée pour augmenter la quantité d'atténuation, une seconde section de stockage de période de temps (18b) pour fixer une période de temps utilisée pour diminuer la quantité d'atténuation, une section de stockage de valeur d'atténuation (18c) pour stocker une valeur d'atténuation déterminée par ladite section de décision de valeur d'atténuation (17a) et une valeur entrée à partir d'un dispositif externe, une section de fixation d'incrément (18d) pour fixer une quantité d'incrément d'atténuation et une section de fixation de décrément (18e) pour fixer une quantité de décrément d'atténuation.
  6. Dispositif de commande de niveau de sortie selon la revendication 5, dans lequel ladite première période de temps est égale ou inférieure à ladite seconde période de temps.
  7. Dispositif de commande de niveau de sortie selon la revendication 5 ou 6, dans lequel ladite quantité d'incrément d'atténuation est supérieure à ladite quantité de décrément d'atténuation.
  8. Dispositif de commande de niveau de sortie selon l'une quelconque des revendications 1 à 7, dans lequel :
       lesdits moyens de correction de niveau de sortie (3), dans lesquels des premières informations prescrivant une première vitesse par rapport au temps pour augmenter la quantité d'atténuation et des secondes informations prescrivant une seconde vitesse par rapport au temps, qui est inférieure à la première vitesse, pour diminuer la quantité d'atténuation, sont fixées, envoient le signal de commande auxdits moyens d'atténuation de signal (1) pour augmenter la quantité d'atténuation à la première vitesse lorsque ledit niveau de sortie reproduit est supérieur audit niveau de signal de référence et pour diminuer la quantité d'atténuation à la seconde vitesse lorsque ledit niveau de sortie reproduit est inférieur audit niveau de signal de référence.
  9. Dispositif de commande de niveau de sortie selon l'une quelconque des revendications 1 à 7, dans lequel :
       lesdits moyens d'atténuation de signal (1) atténuent le niveau de sortie reproduit, de sorte que la quantité d'atténuation soit augmentée à plusieurs reprise à une première vitesse par rapport au temps aussi longtemps que ledit niveau de sortie reproduit est supérieur audit niveau de signal de référence et de sorte que la quantité d'atténuation soit diminuée à plusieurs reprises à une seconde vitesse par rapport au temps, qui est inférieure à ladite première vitesse, lorsque ledit niveau de sortie reproduit est inférieur au niveau de signal de référence.
EP91303933A 1990-10-09 1991-05-01 Dispositif de commande du niveau du signal de sortie Expired - Lifetime EP0480558B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2270710A JPH04150106A (ja) 1990-10-09 1990-10-09 出力レベル制御装置
JP270710/90 1990-10-09

Publications (3)

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EP0480558A2 EP0480558A2 (fr) 1992-04-15
EP0480558A3 EP0480558A3 (en) 1993-01-27
EP0480558B1 true EP0480558B1 (fr) 1998-02-11

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EP (1) EP0480558B1 (fr)
JP (1) JPH04150106A (fr)
DE (1) DE69128906T2 (fr)

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Also Published As

Publication number Publication date
DE69128906D1 (de) 1998-03-19
JPH04150106A (ja) 1992-05-22
DE69128906T2 (de) 1998-07-30
EP0480558A2 (fr) 1992-04-15
EP0480558A3 (en) 1993-01-27
US5195075A (en) 1993-03-16

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